twistedtree
Guru
There are a lot of parallels to this question in the thread I started regarding choosing between buying a larger AC charger vs. a larger genny alternator. Lots of opinions and good ideas there - My take away was it comes down to dollars per additional KWH for your situation.
I am going to give a larger alternator (120 amps) on my genny a go when I get back from my current trip.
As an aside.. I think my generator is 40A and my ME alternators are 80 amp. They both charge their respective battery banks with a dumb internal regulator over a 10gauge wire (over 20' in length for stbd ME) - this is a terribly inefficient way to get watt hours. I would guess lots of opportunity in just improving the regulation and conductors in existing setups.
Sounds like both you and Easting are going to proceed with your original plans. It would be great to hear back from you how it works out once you have some time using it.